A multi-effect multiplier storage pond

Abstract

The present invention discloses a multi-effect multiplication storage tank, which designs a storage tank with composite functions and effects behind the rainwater pump group of the pumping station. The storage tank is used to temporarily store combined sewage, misconnected sewage, initial rainwater, etc., and form power-free quality improvement in the storage tank, increase the concentration of intercepted sewage in the pumping station, and reduce the pollutants entering the river when the pumping station discharges into the river. The present invention can alleviate the impact of the pumping station discharging into the river on the water quality of the river and solve the problem of river black odor. The present invention can be applied to drainage systems of various systems, with diverse effects, flexible operation, less engineering investment, low operation and maintenance costs, and at the same time can increase the engineering benefits of existing projects, and can effectively control the pollution of the pumping station discharging into the river in a short period of time. It is not only applicable to the treatment of combined sewer overflows, but also can be applied to the treatment of initial rain pollution in separate systems.

Description

Technical Field

[0001] The present invention belongs to the technical field of black and odorous river regulation, and is a facility for controlling the pollution of pumping stations discharging into the river. Specifically, it refers to a multi-effect multiplier storage tank. Background Art

[0002] With the rapid development of cities and the continuous increase in population density, the water environment problems of rivers have become increasingly prominent, and most urban rivers have evolved into black and odorous rivers. The problems of black and odorous rivers have a serious impact on the living quality of surrounding residents and the urban image. In addition to the destruction of the river ecosystem caused by urban construction, the main cause of river blackening and odoring is the external source pollution caused by direct pollutant discharge into the river, which is the main reason for the external source pollution of black and odorous rivers.

[0003] In the existing measures for controlling the pollution of pumping stations discharging into the river, they mainly include the source control of initial rainwater, the transformation of rainwater-sewage mixed connections in pipelines, the dredging of drainage pipelines, the interception of pollutants at pumping stations, the off-site treatment of sewage, etc. However, due to the limitations of each technical means, it is difficult to solve the problem of river blackening and odoring in a short time.

[0004] The source control technology of initial rainwater refers to using source control technology to reduce the pollutants in the initial rainfall runoff, prevent pollutants from entering the municipal drainage pipeline, and finally enter the receiving river through the pumping station discharging into the river. However, the pollution of the initial rainfall runoff belongs to non-point source pollution, which involves a large area. Traditional source control technology cannot cover most areas in a short time, resulting in the ineffective control of the pollution of the initial rainfall runoff.

[0005] The transformation of rainwater-sewage mixed connections in drainage pipelines refers to eliminating the mixed connection points in municipal pumping stations through engineering transformation to prevent sewage from entering the rainwater system and reducing the pollutants entering the river through the pumping station discharging into the river. However, there are numerous mixed connection points in the municipal drainage system, and the workload of one-by-one investigation and transformation is huge, with a long cycle, and it is impossible to effectively control the pollutants entering the river due to pipeline mixed connections in the short term.

[0006] Drainage pipeline dredging is to regularly clean the sediments in the pipeline to prevent pollutants from entering the river through the pumping station discharging into the river when a large amount of rainwater flushes the sediments at the bottom of the pipeline during rainfall. However, due to limited social resources, the dredging cycle of pipelines is relatively long, and the amount of sediments in the main drainage system pipeline is large and difficult to clean, so the traditional drainage pipeline dredging technology has limited effect on controlling the pollution of pumping stations discharging into the river.

[0007] The technology of intercepting pollutants at pumping stations refers to setting up pollution interception facilities in drainage pumping stations to intercept the sewage mixed in dry weather, the initial rainwater in rainy days, etc., to prevent pollutants from entering the river through the pumping station discharging into the river. However, the scale of the pollution interception pump is much smaller than that of the rain pump, and the scale of the pollution interception pump in the rain pumping station is even one-fortieth of that of the rain pump. When a rainfall event occurs, the pollution interception pump cannot discharge a large amount of rainwater mixed with pollutants into the sewage system in rainy days, and the rain pump must be turned on to discharge into the river, resulting in pollutants entering the water body.

[0008] An off-site sewage treatment device refers to a small sewage treatment system installed inside or around a municipal pumping station to treat the sewage in the forebay of the pumping station and the initial rainwater during rainy days online. However, the scale of the off-site treatment device is limited and it is unable to treat a large amount of runoff generated during rainy days and pollutants flushed from the drainage system pipes in a short time.

[0009] The current pumping station discharge control technology has limitations such as a long construction period, high investment, and no immediate effect in the short term. In addition, some drainage pumping stations are equipped with storage ponds inside the pumping station, which are connected in parallel with the forebay of the pumping station to collect the initial rainwater and reduce the peak of rainwater runoff. However, at present, many drainage systems are operating in a high water level mode, the main pipe diameter of the system is large, the flow velocity of dry weather sewage in the pipe is low, pollutants are easily deposited at the bottom of the pipe, and the sewage with a low concentration enters the forebay of the pumping station. When a rainfall event occurs and the water level in the forebay rises and the storage pond is opened, the pollutant concentration in the rainwater entering the storage pond is low, resulting in a low control efficiency of the storage pond for the initial rainwater. Generally, a drain pump is required to empty the storage pond, which consumes a high amount of energy. The burial depth of the storage pond can reach more than 20m underground, the project investment is high, and at the same time, the cleaning and maintenance costs are high, and the engineering benefits are poor.

[0010] Therefore, inventing a multi-effect multiplication storage pond and applying it to municipal pumping stations can effectively control the pollution of pumping station discharges and reduce the pollutants entering the river, which is a necessary means to achieve the long-term clarity of black and smelly rivers. Summary of the Invention

[0011] The purpose of the present invention is to provide a multi-effect multiplication storage pond, which can collect the combined sewage, initial rainwater, etc. in the drainage system during the dry season and rainy days, improve the concentration of the intercepted sewage in the pumping station, control the pollutants entering the river, reduce the impact of pumping station discharges on the black and smelly of the river, maintain the effect of treating black and smelly rivers, and achieve long-term clarity.

[0012] To achieve the above purpose, the technical solution of the present invention is as follows: A multi-effect multiplication storage pond, the municipal drainage pumping station includes a forebay of the pumping station, a sewage interception pump group, and a rainwater pump group, and the rainwater pump group is connected to the pumping station outlet well; it is characterized in that a storage pond is arranged after the rainwater pump group, the storage pond is connected to the pumping station outlet well, and at the same time, a communication pipe is arranged at the bottom of the storage pond to communicate with the forebay of the pumping station, and an emptying pipe is arranged in the storage pond for emptying the storage pond; a first control gate is arranged between the outlet well and the external drainage river, a second control gate is arranged between the storage pond and the pumping station outlet well, a third control gate is arranged at the communication pipe between the bottom of the storage pond and the forebay of the pumping station, and a fourth emptying gate is arranged at the emptying pipe of the storage pond; by the first control gate, the second control gate, the third control gate, and the fourth control gate, the operating conditions of the multi-effect multiplication storage pond are switched, and the operating conditions include: pumping station discharge mode, storage pond opening mode, storage pond emptying mode, and storage pond flushing mode.

[0013] Further, a pumping station control system is provided for the municipal drainage pumping station, and a liquid level monitoring device and a water quality monitoring device are respectively installed in the forebay and the storage tank of the pumping station.

[0014] In the river discharge mode of the pumping station, the first control gate is opened, and the second and third control gates are closed. Meanwhile, the rainwater pumping station is started.

[0015] In the opening mode of the storage tank, when the liquid level in the storage tank is higher than the water level in the forebay of the pumping station, the first, third, and fourth control gates are closed, the second control gate is opened, and the rainwater pump group is started simultaneously. Water is pumped in by the pump. When the water level in the forebay of the pumping station is higher than the liquid level in the storage tank, the third control gate is opened, and water enters by gravity.

[0016] The emptying mode of the storage tank is divided into three stages. In the first stage, the rainwater pump group is closed. When the water quality of the upper layer in the storage tank reaches the river discharge standard, the first and second control gates are automatically opened, and the third control valve is closed to discharge the upper layer of water in the storage tank into the river. In the second stage, when the water level in the storage tank drops to the first set position, the fourth control gate is opened to empty the middle layer of the storage tank. In the third stage, when the water level in the storage tank drops to the second set position, the third control gate is opened to empty the bottom layer of the storage tank.

[0017] In the flushing mode of the storage tank, the first and fourth control gates are closed, the second and third control gates are opened, and the rainwater pump group is started simultaneously.

[0018] In the opening mode of the storage tank, switching can be carried out according to the liquid level conditions in the forebay and the storage tank of the pumping station to save energy to the greatest extent. When the water level in the forebay of the pumping station is higher than the liquid level in the storage tank, the third control gate is opened, and water enters by gravity. When the liquid level in the storage tank is higher than the water level in the forebay of the pumping station, the third control gate is closed, and water is pumped in by the pump.

[0019] Further, the operating conditions of the multi-effect multiplier storage tank include the following steps:

[0020] Step 1, on dry days, the first, third, and fourth control gates are closed, the second control gate is opened, and the rainwater pump group is started simultaneously to enter the water inlet mode of the storage tank. After the rainwater pump group lifts the water in the forebay of the pumping station to the outlet well of the pumping station, it flows into the storage tank by gravity.

[0021] Step 2, when the storage tank is full, the liquid level monitoring device in the storage tank transmits a signal to the pumping station control system to close the rainwater pump group and the second control gate. The pollutants in the stored water in the storage tank naturally settle and accumulate at the bottom of the tank.

[0022] Step 3: After a period of sedimentation, the water quality of the uppermost layer in the storage tank is relatively good. When the water quality of the upper layer is better than the permitted water quality for discharging into the river, the water quality monitoring device in the storage tank transmits a signal to the pump station control system to open the first control gate and the second control gate, so that the uppermost layer of water in the storage tank enters the river through the outlet well of the pump station.

[0023] Step 4: When the emptying of the upper layer of water is completed, the liquid level monitoring device in the storage tank transmits a signal to the pump station control system to close the second control gate and open the fourth control gate to empty the middle layer of the storage tank, and the discharged water is used to flush the drainage main pipe or directly transported to the sewage collection system.

[0024] Step 5: After the middle layer of water in the storage tank is emptied, the liquid level monitoring device in the storage tank transmits a signal to the pump station control system to open the third control valve, so that the water with a higher concentration at the bottom layer of the storage tank enters the forebay of the pump station, and the sewage is pumped to the sewage collection system through the sewage interception pump set in the forebay of the pump station.

[0025] Furthermore, the operating conditions of the multi-effect multiplier storage tank can be divided into dry weather conditions and rainy weather conditions. During dry weather, the mixed sewage enters the drainage system and finally enters the forebay of the pump station, causing the water level in the forebay to rise. By starting the rainwater pump set, the mixed sewage is lifted into the storage tank; after the rainwater pump starts, it will disturb the forebay of the pump station, causing the bottom mud in the forebay to turn up, mixing the pollutants deposited in the forebay with the water in the forebay and entering the storage tank together; due to the start of the rainwater pump, the flow velocity in the main pipe of the drainage system increases, scouring the bottom mud in the main pipe of the system, and the pollutants are finally pumped into the storage tank, avoiding the direct discharge of pollutants into the river when rainfall occurs, such as rain scouring the sediment at the bottom of the main pipe of the system and the bottom mud in the forebay of the pump station. During rainy weather, the initial rainwater, the sediment scoured from the bottom of the main pipe of the system by rain, and the bottom mud in the forebay of the pump station first enter the storage tank, and then are discharged into the river after the storage tank is full, minimizing the impact of the initial rainwater on the water quality of the river.

[0026] Furthermore, the storage tank is located behind the rainwater pump set. The storage tank can temporarily store the combined sewage and mixed sewage from the forebay of the pump station and the main pipe of the drainage system. The sewage in the storage tank can be upgraded without power, improving the concentration of the intercepted sewage in the drainage pump station.

[0027] The multi-effect multiplier storage tank can achieve non-powered upgrading, causing the pollutants entering the storage tank to accumulate towards the bottom of the tank, forming high-concentration sewage. The high-concentration sewage in the drainage system is transported to the sewage system through the sewage interception pump set, and the water with better quality in the upper layer of the storage tank is discharged into the river; by starting the rainwater pump set multiple times during dry weather, the pollutants deposited in the main pipe of the drainage system are gradually transported to the sewage system in a cyclic manner, achieving the separation of clean and dirty water at the source and reducing the total amount of pollutants entering the river during the discharge.

[0028] Furthermore, a chute is provided at the bottom of the multi-effect multiplier storage tank to prevent sediment deposition. When the storage tank is emptied and flushed, the rainwater pump group can be used to pump the water from the forebay of the pump group to flush the storage tank, and the "dirty water" after flushing can be returned to the forebay of the pump station through the bottom connecting pipe, and the "dirty water" can be transported to the sewage system by the pollution interception pump group.

[0029] Furthermore, the multi-effect multiplier storage tank can adopt the construction forms of underground, semi-underground and above-ground according to conditions such as the land around the pump station and the head of the rainwater pump. For pump stations with a relatively high head of rainwater pumps, the storage tank can adopt the above-ground or semi-underground form; for pump stations with a relatively low head of rainwater pumps, an underground storage tank can be adopted. By adjusting the head of the rainwater pump, the burial depth of the storage tank can be achieved. Therefore, for pump stations with high requirements for the surrounding environmental landscape and restricted land use, semi-underground or underground storage tanks can be adopted, and greening can be set on the top of the storage tank; for areas with good land conditions and low landscape requirements, above-ground or semi-underground storage tanks can be adopted.

[0030] For the multi-effect multiplier storage tank of the present invention, the storage tank is arranged behind the rainwater pump group, making the best use of the existing facilities of the municipal pump station. The rainwater pump pumps the dry-weather mixed sewage, the initial rainwater in rainy days, and the scoured pipeline sediments into the storage tank, effectively reducing the pollutants discharged into the water body through the pump station. The construction mode of the storage tank can be flexibly set according to the characteristics of the pump station. The storage tank can be emptied by gravity to save energy consumption, and the "sewage" is stratified by the storage tank to achieve the separation of clean and dirty in the pump station, improving the collection efficiency of the sewage collection system. The storage tank can realize intelligent control and flexible operation through liquid level and water quality monitoring. Compared with the traditional construction method of the storage tank, the present invention can increase the use frequency of the storage tank, increase the control effect of the storage tank on mixed sewage, initial rainwater and pipeline sediment pollutants, and at the same time be more energy-saving, save project investment, and greatly increase the engineering benefits of the storage tank.

[0031] The method for controlling the pollution of the pump station discharge by constructing a storage tank provided by the present invention has the following advantages:

[0032] (1) The control effect of the storage tank on the initial rainwater, mixed sewage and pipeline sediment pollutants is increased;

[0033] (2) The construction method and location setting of the storage tank are flexible and changeable, greatly reducing the burial depth and saving investment;

[0034] (3) The use frequency of the storage tank is increased, and the engineering benefits are increased;

[0035] (4) The storage tank is emptied by gravity, saving energy consumption;

[0036] (5) Flexible operation, convenient management, and low operation and maintenance costs. Description of the Drawings

[0037] Figure 1 This is a schematic cross-sectional view of a multi-effect multiplier storage tank of the present invention.

[0038] Figure 2 This is a schematic plan layout of a multi-effect multiplier storage tank of the present invention.

[0039] Figure 3 This is a process flow chart of a multi-effect multiplier storage tank of the present invention.

[0040] The figure includes: municipal drainage pump station 1, forebay 11 of the pump station, sewage interception pump group 12, rainwater pump group 13, storage tank 14, pump station outlet well 15, first control gate 31, second control gate 32, third control gate 33, fourth control gate 34, connecting pipe 35, gravity drain pipe 36. Specific implementation manners

[0041] The following further describes the specific implementation manners of the present invention with reference to the accompanying drawings.

[0042] A multi-effect multiplier storage tank of the present invention forms a pollutant discharge control system with the facilities in the existing municipal pump station, as Figure 1 shown. This system includes:

[0043] The forebay 11, sewage interception pump group 12, and rainwater pump group 13 in the municipal drainage pump station 1, the storage tank 14 adjacent to the forebay 11, a pump station outlet well 15 is arranged behind the rainwater pump group 13, the pump station outlet well 15 is located above the storage tank 14, a first control gate 31 is arranged between the pump station outlet well 15 and the river, a second control gate 32 is arranged between the pump station outlet well 15 and the storage tank 14, a connecting pipe 35 and a third control gate 33 are arranged between the storage tank 14 and the forebay 11 of the pump station, and a fourth control gate 34 is arranged at the drain pipe of the storage tank. An intelligent control system is added to the control room of the municipal drainage pump station 1, and water level and water quality monitoring systems are installed in the forebay 11 and the storage tank 14.

[0044] The first control gate 31, the second control gate 32, the third control gate 33, and the fourth control gate 34 are used to switch the pumping station's river discharge mode, regulating pond opening mode, regulating pond emptying mode, regulating pond flushing mode, etc. When the first control gate 31 is opened and the second control gate 32 and the third control gate 33 are closed, the rainwater pumping station 13 is started simultaneously to enter the river discharge mode of the pumping station; when the first control gate 31, the third control gate 33, and the fourth control gate 34 are closed and the second control gate 32 is opened, the rainwater pump group 13 is started simultaneously to enter the regulating pond opening mode; when the rainwater pump group 13 is closed and the third control gate 33 and the fourth control gate 34 are opened, the regulating pond emptying mode is entered; when the first control gate 31 and the fourth control gate 34 are closed and the second control gate 32 and the third control gate 33 are opened, the rainwater pump group is started simultaneously to enter the regulating pond flushing mode.

[0045] During dry weather, the mixed sewage in the plots and branch pipes flows into the main drainage system pipe 2 and is transported to the forebay 11 of the municipal drainage pumping station 1. Pollutants in the water accumulate in the pipeline during transportation to form pipeline sediments, and the pollutant concentration of the sewage reaching the forebay 11 is relatively low. When the regulating pond inlet mode is opened, the flow velocity in the main drainage system pipe 2 increases, scouring the sediments at the bottom of the pipe, and the pollutant concentration in the pipeline rises rapidly. The pollutants flow through the forebay 11 with the water flow. At the same time, due to the opening of the rainwater pump 13, the bottom mud in the forebay is turned up, and the pollutants enter the regulating pond 14 together. After the regulating pond 14 is full, the rainwater pump 13 is closed to stop the water inlet, and the pollutants in the water naturally settle in the regulating pond 14 and accumulate at the bottom of the pond. After a period of time, the regulating pond emptying mode is opened, the upper layer of water with a relatively low concentration is discharged into the river, the middle layer of sewage with average water quality is emptied into the sewage system or used to flush the main drainage system pipe 2, and the lower layer of sewage with a relatively high concentration is sent to the forebay through the connecting pipe and finally transported to the sewage system through the intercepting pump.

[0046] The method for controlling the river discharge pollution of the pumping station by using the multi-effect multiplication regulating pond of the present invention includes the following steps:

[0047] Step 1, during dry weather, the first control gate 31, the third control gate 33, and the fourth control gate 34 are closed, the second control gate 32 is opened, and the rainwater pump group 13 is started simultaneously to enter the regulating pond inlet mode. After the rainwater pump group 13 lifts the water in the forebay 11 of the pumping station to the outlet well 15, it flows into the regulating pond 14 by gravity.

[0048] Step 2, when the regulating pond 14 is full, the liquid level monitoring system in the regulating pond 14 transmits a signal to the pumping station control system, the rainwater pump group 13 and the second control gate 32 are closed, and the pollutants in the stored water in the regulating pond 14 naturally settle and accumulate at the bottom of the pond.

[0049] Step 3: After a period of sedimentation, the water quality of the uppermost layer in the storage tank 14 is relatively good. When the water quality of the upper layer is better than the permitted water quality for discharging into the river, open the first control gate 31 and the second control gate 32 to allow the water in the uppermost layer of the storage tank 14 to enter the river through the pump station outlet well 15.

[0050] Step 4: After the upper layer of water is emptied, close the second control gate 32 and open the fourth control gate 34 to empty the middle layer of the storage tank 14. The water quality of the middle layer is average, and the discharged water is used to flush the drainage main pipe 2 or directly transported to the sewage collection system.

[0051] Step 5: After the middle layer of water in the storage tank 14 is emptied, open the fourth control valve 34 to allow the water with a higher concentration in the bottom layer of the storage tank 14 to enter the forebay of the pump station, and pump the sewage to the sewage collection system through the sewage pump set 12 in the forebay.

[0052] In the present invention, the forebay 11, the sewage pump set 12, the rainwater pump set 13, and the pump station outlet well 15 in the municipal pump station 1 are all basic facilities of a general municipal pump station. Only by setting a storage tank 14 behind the rainwater pump set 13 can the effective control of the pollution discharged from the pump station be achieved.

[0053] The rainwater pump is an important part of the municipal pump station and is only used on rainy days, resulting in a low equipment utilization rate; conventional storage tanks are generally connected in parallel with the forebay of the pump station, with a relatively deep burial depth and a large investment, and are generally used on rainy days with a low usage frequency. By setting a storage tank behind the rainwater pump set and simultaneously setting connecting control gates in the present invention, the operation modes of the storage tank are increased, and the utilization rates of the rainwater pump set and the storage tank are improved, thus improving the engineering benefits.

[0054] The rainwater pumps configured in the municipal pump station generally select a suitable pump head according to the water level in the forebay of the pump station and the water level of the pump station outlet. According to the head of the configured rainwater pumps, storage tanks with different construction forms can be selected. For municipal pump stations with a higher pump head, the storage tank can be semi-underground or above-ground; for municipal pump stations with a lower pump head, the storage tank can be underground or semi-underground. Compared with traditional storage tanks, the burial depth of the storage tank is greatly reduced, saving engineering investment.

[0055] The intelligent control system includes water level and water quality monitoring devices in the forebay of the pump station and the storage tank. The intelligent control system can automatically switch the operation mode according to the water level and water quality in the pump station storage tank.

[0056] Opening the storage tank inlet mode on dry days means collecting and "concentrating" the pipe sediments and mixed sewage in the drainage system using the idle rainwater pump set and storage tank on non-rainy days; the rainwater pumps configured in the rainwater pump set can pump water from the forebay of the pump station and enter the storage tank through the pipe of the pump station outlet well. The pollutants are sedimented and stratified in the storage tank, and the storage tank is emptied layer by layer to achieve the separation of clean and dirty water in the pump station.

[0057] When the storage tank inlet mode is turned on in rainy days, the storage tank is used to collect the initial rainwater in rainy days and the pollutants generated by the scouring of the pipeline sediments brought by heavy rain.

[0058] The storage tank has a shallow buried depth, and the temporarily stored sewage in the storage tank can be emptied into the sewage collection system or used for flushing the main pipe of the drainage system in the form of gravity emptying, saving energy consumption.

[0059] After the storage tank is used up, it does not need to be manually cleaned. The water in the forebay of the pumping station can be pumped by the rainwater pump group to flush the storage tank, saving resources and reducing the operation and maintenance costs; a chute 37 is arranged at the bottom of the storage tank to prevent siltation. As Figure 2 shown, the chute is distributed in a snake shape along the length direction of the storage tank, including straight channels arranged along the width direction of the storage tank and curved channels connecting two adjacent straight channels. The straight channels are provided with slopes, and the slopes are between 0.5% and 1%. At the turning point of the chute, the slope of the curved channel is 1% to 2%. The bottom of the chute is arc-shaped, and the bottom radius of the chute is between 0.8 m and 1.2 m. By arranging the chute, the flow velocity at the bottom of the storage tank is increased, the siltation at the bottom of the tank is reduced, and the flushing efficiency of the storage tank is improved. It should be noted that Figure 1 This is only a schematic diagram of the cross-section of the present invention, so the slope of the chute is not shown in the figure. In fact, in this embodiment, the chute arranged at the bottom of the storage tank has a slope, and the setting direction of the slope is as Figure 2 shown.

[0060] The inlet mode of the storage tank can be switched according to the liquid level conditions in the forebay of the pumping station and the storage tank, saving energy consumption to the greatest extent: when the water level in the forebay of the pumping station is higher than the liquid level in the storage tank, the control gate at the bottom connection can be opened, and the gravity inlet mode can be adopted; when the liquid level in the storage tank is higher than the water level in the forebay of the pumping station, the control gate at the bottom connection needs to be closed, and the pumping method is adopted for inlet.

[0061] A multi-effect multiplier storage tank of the present invention can control the pollutants entering the river by collecting the combined sewage, initial rainwater, etc. in the drainage system in dry seasons and rainy seasons. At the same time, the concentration of the intercepted sewage in the municipal pumping station is increased by a non-powered quality improvement method. The intercepted flow is small, effectively reducing the burden on the sewage treatment plant. After the storage tank is used, it does not need to be manually cleaned, has no bottom mud, is highly energy-efficient, saves land and project investment. The storage tank makes the greatest possible use of the existing municipal facilities, improves the utilization rate of municipal facilities, increases the project benefits, and effectively controls the pollution of the pumping station discharging into the river in a short time.

[0062] Although the content of the present invention has been described in detail through the above preferred embodiments, it should be recognized that the above description should not be considered as a limitation of the present invention. After those skilled in the art have read the above content, various modifications and alternatives to the present invention will be obvious. Therefore, the protection scope of the present invention should be defined by the appended claims.

Claims

1. A multi-effect multiplication storage tank, where the municipal drainage pump station includes a pump station forebay, a sewage interception pump group, and a rainwater pump group, and the rainwater pump group is connected to the pump station outlet well; it is characterized in that: A storage tank is arranged behind the rainwater pump group. The storage tank is communicated with the outlet well of the pump station. At the same time, a connecting pipe is arranged at the bottom of the storage tank and communicated with the forebay of the pump station. A drain pipe is arranged in the storage tank for emptying the storage tank. A first control gate is arranged between the outlet well and the external drainage river. A second control gate is arranged between the storage tank and the outlet well of the pump station. A third control gate is arranged at the connecting pipe between the bottom of the storage tank and the forebay of the pump station. A fourth control gate is arranged at the drain pipe of the storage tank. A chute is arranged at the bottom of the storage tank. By means of the first control gate, the second control gate, the third control gate and the fourth control gate, the operating conditions of the multi-effect multiplication storage tank are switched. The operating conditions include: the pump station discharging into the river mode, the storage tank opening mode, the storage tank emptying mode and the storage tank flushing mode. In the storage tank flushing mode, the first control gate and the fourth control gate are closed, the second control gate and the third control gate are opened, and at the same time, the rainwater pump group is started. The municipal drainage pump station is provided with a pump station control system. A liquid level monitoring device and a water quality monitoring device are respectively installed in the forebay of the pump station and in the storage tank. The operation process of using the multi-effect multiplication storage tank to control the pollution discharged by the pump station into the river includes the following steps: Step 1, on dry days, the first control gate, the third control gate and the fourth control gate are closed, the second control gate is opened, and at the same time, the rainwater pump group is started to enter the storage tank water inlet mode. After the rainwater pump group lifts the water in the forebay of the pump station to the outlet well of the pump station, it flows into the storage tank by gravity. Step 2, when the storage tank is full, the liquid level monitoring device in the storage tank transmits a signal to the pump station control system, the rainwater pump group and the second control gate are closed, and the pollutants in the stored water in the storage tank settle naturally and accumulate towards the bottom of the tank. Step 3, after a period of sedimentation, the water quality of the uppermost layer in the storage tank is better. When the water quality of the upper layer is better than the allowable water quality for discharging into the river, the water quality monitoring device in the storage tank transmits a signal to the pump station control system, the first control gate and the second control gate are opened, so that the uppermost layer of water in the storage tank enters the river through the outlet well of the pump station. Step 4, when the emptying of the upper layer of water is completed, the liquid level monitoring device in the storage tank transmits a signal to the pump station control system, the second control gate is closed, and the fourth control gate is opened to empty the middle layer of the storage tank. The outlet water is used to flush the drainage main pipe or directly transported to the sewage collection system. Step 5, after the middle layer of water in the storage tank is emptied, the liquid level monitoring device in the storage tank transmits a signal to the pump station control system, the third control gate is opened, so that the water with a higher concentration at the bottom of the storage tank enters the forebay of the pump station, and the sewage is pumped to the sewage collection system through the sewage interception pump group in the forebay of the pump station.

2. The multi-effect multiplication storage tank according to claim 1, wherein In the pump station discharging into the river mode, the first control gate is opened, the second control gate and the third control gate are closed, and at the same time, the rainwater pump station is started. In the storage tank opening mode, when the liquid level in the storage tank is higher than the water level in the forebay of the pumping station, the first control gate, the third control gate, and the fourth control gate are closed, the second control gate is opened, and at the same time, the rainwater pump group is started, and water is inlet by means of pump lifting; if the water level in the forebay of the pumping station is higher than the liquid level in the storage tank, the third control gate is opened, and water is inlet by means of gravity. The storage tank emptying mode is divided into three stages. In the first stage, the rainwater pump group is closed. When the water quality in the upper layer of the storage tank reaches the river discharge standard, the first and second control gates are automatically opened, the third control gate is closed, and the upper layer of water in the storage tank is discharged into the river; in the second stage, when the water level in the storage tank drops to the first set position, the fourth control gate is opened to empty the middle layer of the storage tank; in the third stage, when the water level in the storage tank drops to the second set position, the third control gate is opened to empty the bottom layer of the storage tank.

3. The multi-effect multiplication regulation and storage pond according to claim 1, characterized in that, The multi-effect multiplication storage tank adopts an underground, semi-underground or above-ground construction form. For pumping stations with a relatively high lift of rainwater pumps, the storage tank adopts an above-ground or semi-underground form; for pumping stations with a relatively low lift of rainwater pumps, an underground storage tank is adopted.

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